I got SAML setup on my AD and I have the private and certificate PEMs along with the certificate and metadata and I want to know if it's possible to bypass the login from API? I'm developing a Node.JS API which I want to make requests to the server behind the SAML login but I need to bypass it with what I got.
Maybe a way to generate a token from Azure's API (to use as bearer authorization) would work like how you do it with OAuth?
I'm not asking for any other solution (like whitelisting etc.), I just need it to be token / API based
To bypass azure ad , you may chose for the On behalf flow.
For single-page apps (SPAs), here we pass an access token to a middle-tier confidential client to perform OBO flows instead.
This will only work, if the respective permissions (scope grants) are
already granted when you try to get an access token using the
on-behalf of flow.
Here API A authenticates to the Microsoft identity platform token
issuance endpoint and requests a token to access API B.
https://login.microsoftonline.com/<tenant>/oauth2/v2.0/token
with grant_type=urn:ietf:params:oauth:grant-type:jwt-bearer
client_id=xxx
&client_secret=saxx1s
&scope=https://graph.microsoft.com/user.read+offline_access
&requested_token_use=on_behalf_of
Here we need to expose api and here I am giving user.read
And exposed api
The response has access token , refresh token
{
"token_type": "Bearer",
"scope": "https://graph.microsoft.com/user.read",
"expires_in": 3269,
"ext_expires_in": 0,
"access_token": "xx",
"refresh_token": "xxxx"
}
Please check Microsoft identity platform and OAuth2.0 On-Behalf-Of flow - Microsoft Entra | Microsoft Learn
Reference : how-to-use-azure-ad-access-token-to-bypass-microsoft-online-login
Related
Here's the configuration for the Azure AD B2C, create two applications: web and api. added two scopes read and write to the api scope. configure web application to web application. tested with the built-in user flows e.g. sign up sign in. run the flow for the web app, get the access token, scopes are in the token.
now create a custom policy to use multitenants to authenticate the users with Azure AD. created a custom signup/in policy. run the policy, got the access token by specifying the api scopes in the access token, however the return token does not contain the scope claims. my question is how to configure the custom policy to have the api scopes in the access token?
When you run the custom policy, it will only return an ID token rather than access token.
So your scope claims won't be included in the ID token.
You should refer to Request an access token in Azure Active Directory B2C.
After you have Added a web API application to your Azure Active Directory B2C tenant, use authorization code flow to get the access token.
GET https://<tenant-name>.b2clogin.com/tfp/<tenant-name>.onmicrosoft.com/<policy-name>/oauth2/v2.0/authorize?
client_id=<application-ID>
&nonce=anyRandomValue
&redirect_uri=https://jwt.ms
&scope=https://<tenant-name>.onmicrosoft.com/api/read
&response_type=code
The response with the authorization code should be similar to this example:
https://jwt.ms/?code=eyJraWQiOiJjcGltY29yZV8wOTI1MjAxNSIsInZlciI6IjEuMC...
After successfully receiving the authorization code, you can use it to request an access token:
POST <tenant-name>.onmicrosoft.com/oauth2/v2.0/token?p=<policy-name> HTTP/1.1
Host: <tenant-name>.b2clogin.com
Content-Type: application/x-www-form-urlencoded
grant_type=authorization_code
&client_id=<application-ID>
&scope=https://<tenant-name>.onmicrosoft.com/api/read
&code=eyJraWQiOiJjcGltY29yZV8wOTI1MjAxNSIsInZlciI6IjEuMC...
&redirect_uri=https://jwt.ms
&client_secret=2hMG2-_:y12n10vwH...
The response:
{
"access_token": "eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6Ilg1ZVhrN...",
"token_type": "Bearer",
"not_before": 1549647431,
"expires_in": 3600,
"expires_on": 1549651031,
"resource": "f2a76e08-93f2-4350-833c-965c02483b11",
"profile_info": "eyJ2ZXIiOiIxLjAiLCJ0aWQiOiJjNjRhNGY3ZC0zMDkxLTRjNzMtYTcyMi1hM2YwNjk0Z..."
}
See details here.
We have developed Web API in .net Core 2.1 without authentication.
But now we are trying to add the Azure AD token based authentication.
we have registered app in azure AD and we did necessary changes in startup.cs file. and added authorize tag
When we test the API in postman we generated token we are getting Microsoft login page in Html format as result.
when we crosscheck the API in browser, its asking domain user name and password by providing the user name password we are getting the result.
Its seems some configuration or setting missing in Azure AD setup or code.
Can anyone help on this. other wise anyone share the steps for token based authentication implementation for API.
If you already have the api , you should firstly register an app in Azure Portal .
In your api application , you can follow the below steps :
Install the package Microsoft.AspNetCore.Authentication.AzureAD.UI
Register the Azure AD Bearer authentication service in ConfigureServices function :
services.AddAuthentication(AzureADDefaults.BearerAuthenticationScheme)
.AddAzureADBearer(options => Configuration.Bind("AzureAd", options));
In appsettings.json , set the correct api configuration from Azure Portal :
"AzureAd": {
"Instance": "https://login.microsoftonline.com/",
"Domain": "YourDomain.onmicrosoft.com",
"TenantId": "cb1c3f2e-a2dd-4fde-bf8f-f75ab18b21ac",
"ClientId": "83bf146d-4948-4596-a4b3-b7b2e68ac3e0"
},
Tenant ID ,domain name and API's ClientId could be find in Azure Portal .Then you can add Authorize attribute on protected controllers/actions . If you have multiple authentication schema , you can authorize with a specific scheme .
You client app will uses the OpenID Connect middleware and the ADAL/MSAL to obtain a JWT bearer token for the signed-in user using the OAuth 2.0 protocol. The bearer token is passed to the web API, which validates the token and authorizes the user using the JWT bearer authentication middleware.
I am making OAuth 2.0 auth code authentication flow with multi-tenant application.
Here is my authorize url:
https://login.microsoftonline.com/common/oauth2/v2.0/authorize?client_id=my_id&prompt=consent&redirect_uri=http%3A%2F%2Flocalhost%3A3000%2Fauthorize&response_type=code&scope=openid+offline_access&state=17
It goes fine and I receive auth_code. Then I make request with this auth_code to token_url and receive a lot of information, like:
token_type
scope
id_token
access_token
refresh_token
expires_at
ext_expires_in
Seems fine to me, but when I make request on API with access_token like:
https://management.azure.com/subscriptions/my_sub_id/locations?api-version=2016-06-01
with headers:
Content-Type:
- application/json
Authorization:
- Bearer EwBQA8l6BAAURSN/FHlDW5xN74t6GzbtsBBeBUYAAV1IHgHb4dOWblzfd/YsSuFicAMDYbua17QivnAT9/pIaeKAg3uKsK5VGqWLzjMOUQrCpd7R1RAM6RkzI0u8e4rpO7DISG7qLso5H5+U1jb+38/j1urcwlXMMxhy83ZXmdpkLXpZV+vcOV...
It responds with 401 error
body:
encoding: UTF-8
string: '{"error":{"code":"InvalidAuthenticationToken","message":"The access token is invalid."}}'
To be honest I think something wrong with my access_token. It seems not like JWT for me. Documentation says it looks like:
"access_token": "eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsIng1dCEV1Q..."
But my access_token looks like:
"access_token": "EwBYA8l6BAAURSN/FHlDW5xN74t6GzbtsBBeBUYAAZDe7JE/MPLoAi+Fr+1Xxq5eBe5N9l8Q+c4QjkY5PGEzRnBpPe7+v6h+PLdh1cceBQx+/JsB2QCrYSCt7x/zGsQAhwoY/"
Is it fine?
Here is my permissions for application:
Permissions
The main issue you have here is that you have only asked for an access token for the scopes openid offline_access. The resulting access token will be for Microsoft Graph (https://graph.microsoft.com), not for the Azure REST API (https://management.azure.com).
To indicate you would like a token for a given API, the scope parameter in your authorization request should include the delegated permission you would like the app to have for the API. In the case of Azure REST API, there's only one delegated permission: user_impersonation. The identifier URI for the Azure REST API is https://management.azure.com, so the scope value you want to use is:
openid offline_access https://management.azure.com/user_impersonation
Two more important notes:
As you've discovered, you will not always be issued an access token as a JWT which you can decode peek at. The format of the access token is an agreement between the service which issued the token (Azure AD or Microsoft Accounts, in this case), and the service for which the token was issued (Microsoft Graph, in this example).
You should not always include prompt=consent. prompt=consent should only be used if you have already tried signing in the user without the user needs to be re-prompted for consent for a new permission.
If you simply include the required scopes in the scopes parameter, the Microsoft Identity platform will take care of figuring out if it needs to prompt for consent or not. If you always include prompt=consent, you will find that many organizations will be blocked from accessing your app, because they've disabled the ability for users to grant consent themselves (and this parameter specifically states that you require the user to be prompted again).
Our web aap is authenticating with the Azure AD via SAML2.0 similar to this.
In return we get SAML assertion(SAML token).
But when the user who logs in have more then 150+ groups the response doesn't contain the group information(so that token size doesn’t exceed HTTP header size limits. More info on this)
But what it return is a Graph Api to be hit to get the group information something like https://graph.windows.net/{tenant id}/users/{user id}/getMemberObject.
By going through this
I understand that I need to attach a Auth bearer token with the http request to hit the graph api successfully.
My problem is how do I get the Auth bearer token?
How can I use the SAML token to get the Auth bearer token?
Other useful link - link1 link2
I've only used the non SAML graph API using the ADAL libraries but from the docs it appears the NameID seems to be the basis for requesting an access token for the Graph API:
<Subject>
<NameID Format="urn:oasis:names:tc:SAML:2.0:nameid-format:persistent">m_H3naDei2LNxUmEcWd0BZlNi_jVET1pMLR6iQSuYmo</NameID>
<SubjectConfirmation Method="urn:oasis:names:tc:SAML:2.0:cm:bearer" />
</Subject>
From this post,
"Here the Client gets a SAML bearer assertion from the SAML Identity
Provider then requests an access token from the Authorisation Server
using the SAML bearer assertion as proof of identity"
and this article states the entire Assertion is used to get the access token, where you:
encode the whole assertion by using base64url encoding before adding
it as part of the POST request
It appears that exchanging a SAML token for a Graph access token is only supported for AD FS, not Azure AD. As per:
This scenario works only when AD FS is the federated identity provider that issued the original SAMLv1 token. You cannot exchange a SAMLv2 token issued by Azure AD for a Microsoft Graph access token.
Source: https://learn.microsoft.com/en-us/azure/active-directory/develop/v2-saml-bearer-assertion.
In general, you have to add the OIDC/OAuth stack to your app. As I understand it, this is in addition to your existing SAML authentication implementation. See: https://learn.microsoft.com/en-us/azure/active-directory/develop/scenario-token-exchange-saml-oauth
I'm trying to get the access token for the Microsoft Graph API in order to access a SharePoint document library. My application is a windows service, hence I'm following the procedure described here.
But when I try to get the access token, the response that I get doesn't have the scope value. Below is my response:
{
"token_type": "Bearer",
"expires_in": "3600",
"expires_on":"1492452559",
"not_before": "1492448659",
"resource": "https://graph.microsoft.com",
"access_token": "Token"
}
Because of this when I try to query the Graph API with this access token, I'm getting an error saying: Either scp or roles claim need to be present in the token
Can someone please help me on how to get this working? Thanks in advance.
That seems your client application hasn't set the appropriate app permissions when using client credential flow , below is an illustration of application permissions section in Azure AD classic portal. Please select appropriate permissions needed and retry :
And in addition , when using client credential flow to get the access token , you could check the roles claims in access token(that is the way to check the app permission, not in token response) , using a tool like http://jwt.calebb.net/ to decode the access token and check the app permissions :